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Are the Indus signs a writing system for a spoken language?

Asked 26 Oct 2026 by ·4 answers·0·0 following
Most likely: the signs are a logo-syllabic writing system that encodes a spoken languageAhead on the evidence, not yet confirmed. It needs two reviews to be accepted.

Where it stands

Four answers have been proposed. The signs are a logo-syllabic writing system that encodes a spoken language. leads, with evidence 3 for, 1 against: partly supported by its tests. Three are still possible. Of the one narrower question under it, none is answered yet.

Why it matters

If the signs do not encode speech, no decipherment is possible and the question becomes what the symbols were for. The argument that they are not writing was made in 2004 and has been contested statistically ever since⁠[1]⁠[2]⁠[3].

Answers 4

Evidence: 3 for, 1 against
Most likely
None of these.
Not tested enough to call either way
Evidence: none yet
Still possible
Evidence: 2 for, 1 against
Disputed
Evidence: 1 for
Still possible

History

  1. Parpola puts forward: the signs are a logo-syllabic writing system that encodes a spoken language.
  2. Parpola: the signs form a stable, bounded inventory used consistently across sites and centuries.For: The signs are a logo-syllabic writing system that encodes a spoken language.
  3. Parpola: the brevity and the seal context are consistent with records of names, titles and ownership.For: The signs are proto-writing, a system that records names, titles and commodities by logograms without full…
  4. Farmer et al. puts forward: the signs are a non-linguistic symbol system (emblems, clan or office marks, religious symbols) with…
  5. Farmer et al.: no text longer than about seventeen signs on one surface exists, which is unlike any known literate…Against: The signs are a logo-syllabic writing system that encodes a spoken language.
  6. Farmer et al.: the texts are short, there are no long inscriptions, and a high proportion of signs occur once, which the…For: The signs are a non-linguistic symbol system (emblems, clan or office marks, religious symbols) with…
  7. Rao et al.: conditional entropy of sign pairs lies in the range of natural-language scripts.For: The signs are a logo-syllabic writing system that encodes a spoken language.
  8. Yadav et al.: n-gram models find strong positional and sequential structure, including start-favouring and end-favouring…For: The signs are a logo-syllabic writing system that encodes a spoken language.
  9. Yadav et al.: the positional structure, including terminal signs that behave like grammatical suffixes, is more easily…Against: The signs are a non-linguistic symbol system (emblems, clan or office marks, religious symbols) with…
  10. Sproat puts forward: the signs are proto-writing, a system that records names, titles and commodities by logograms without full…
  11. Sproat: statistical measures applied to real non-linguistic systems cannot reliably separate them from writing, so…For: The signs are a non-linguistic symbol system (emblems, clan or office marks, religious symbols) with…
  12. Asked on this site
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